Báo cáo lâm nghiệp: "Polyamines during somatic embryo development in Norway spruce (Picea abies [L ])" potx

... di- amine putrescine (Put), triamine spermidine (Spd) and tetramine spermine (Spm). ere are a number of reports indicating that PAs play a crucial role in somatic embryo development including ... QH82303. Polyamines during somatic embryo development in Norway spruce (Picea abies [L. ]) J. M 1 , M. C 2 , P. M 2 , O. M 2 1 Forestry and...

Ngày tải lên: 07/08/2014, 10:21

... P E., R A., P T. (2005): Regional decline of Norway spruce (Picea abies [L. ] Karst.) in the Czech Republic. In: Proccedings Obnova lesních porostů vimisní oblasti východního ... felled by the wind in autumn were checked for the presence of cambioxylophagous in- sects in next spring and autumn. Merocoenoses of cambioxylophagous insects in win...

Ngày tải lên: 07/08/2014, 10:21

... 149 derplantings increases with a decreasing content of these nutrients in needles. An opposite correlation was determined for aluminium: with an increasing proportion of this element in nutrition ... organomineral horizon.  is environment can be simulated during out- planting by mixing humifi cation and organomin- eral horizons at a 3:1 volume ratio in a planting pit 40 × 40 cm...

Ngày tải lên: 07/08/2014, 10:21

... 9–20% (dominance of Norway spruce, Picea abies, 30–50%) and in the Nízký Jeseník Hills (forest coverage 70%, domi- nance of Norway spruce 67.8%) (C 1996). e Norway spruce dominates in both ... a.s.l.) in very young spruce forests (10–20- year-old). All Malaise traps were installed in small forest clearings, minimally 30 m inwards the forest. e forest clearings...

Ngày tải lên: 07/08/2014, 03:22

... contents in spruce needles. The results of this work are in accordance with previous cytokinin measurements in declin- ing spruce trees which also revealed higher levels of cytokinin ribosides in combination ... artificial increase of auxin on the root level can induce changes of the cytokinin content in the shoot. In discussing the elevated content of cytokinin ribosides in...

Ngày tải lên: 08/08/2014, 00:22

... presented in [18] on Norway spruce wood also showed that the longitudinal shrinkage/swell- ing was largest close to the pith and decreased with in- creasing distance from the pith. Longitudinal shrinkage also ... latewood band in one or several growth rings; CW-2: Dominating latewood band in one or several growth rings. 572 C. Bengtsson Figure 2. a)Measurement of shrinkage and swe...

Ngày tải lên: 08/08/2014, 14:21

...  13 C has been increasing since the early 1990s, indicating biological recovery. DISCUSSION Variation in the 13 C isotopic signal at the end of the 19 th century and at the beginning of the 20 th ... fossil belemnite in this case (Vienna-PDB, VPDB, MC, L 2004). ere is a discrimination against 13 C in C3 plants by the carboxylating enzyme Rubisco (~ 27‰) and during...

Ngày tải lên: 07/08/2014, 03:22

... pine (Pinus sylvestris), Norway spruce (Picea abies) , birch (Betula verrucosa) and Douglas fir (Pseudotsuga menziesii) in the territory of the Training Forest Enterprise in Kostelec nad Černými ... performed in the stands of four tree species on afforested agricul- tural lands, in a neighbouring forest stand on con- tinuously forested land (mixed Scots pine – Norway spru...

Ngày tải lên: 07/08/2014, 03:22

... the following hypotheses were tested in this work: – Seeds begin to germinate only after flooding. – Germination rate decreases as the duration of inundation increases. – Inundation during the ... drift during Rhine floods (K et al. 2005), seeding before the start of the flood season in spring can increase the density of regeneration. On the other hand, the planting of seedlings...

Ngày tải lên: 07/08/2014, 03:22

... content in Norway spruce wood is 50.1% of the dry mass and remains stable during the whole decomposition process of deadwood (B et al. 2007). Basic wood density of Norway spruce living trees ... including standing dead trees, lying deadwood, and naturally formed stumps. Basic mensurational information (diameter, height, decay class) about dead wood was collected in the...

Ngày tải lên: 07/08/2014, 10:21